基于扰动插值函数的原状黏土强度分析

原状土的强度问题一直是岩土工程领域非常关心的问题之一,然而由于土样扰动的存在,真正获得原状土样的强度存在较大的困难。基于扰动插值函数的物理概念,提出了一种通过扰动土样强度预测原状土样强度的方法。该方法在Z.Hong和K.Onitsuka扰动度定义的基础上,结合黏性土弹塑性损伤力学模型,将扰动插值函数视为扰动度D_d的指数函数关系式,根据扰动土样的强度及压缩试验结果,通过插值函数推求得到原状土样的强度。基于连云港典型软黏土的振动试验对模型的适用性进行了检验,模型验证结果表明,该预测方法能较好地反映连云港典型软黏土的原状强度。

Analysis of Undisturbed Clay Strength Based on Interpolation Function on Disturbance

Strength of undisturbed soil has gained significant interest among researchers in the field of geotechnical engineering. However, there are difficulties for us to obtain the strength of undisturbed soil due to soil disturbance.Based on the physical concept of interpolation function on disturbance, we propose a new method to predict the strength of undisturbed soil according to the strength of disturbed soil. According to the definition of soil disturbance degree(D_d) by Z.Hong and K.Onitsuka, in association with elastoplastic damage mechanics model of clay, we assume that the relationship between disturbance function and D_d shows tendency of exponential function. Furthermore, we deduce the strength of undisturbed soil by using interpolation function and the results of compression test and strength of disturbed soil. Typical undisturbed soft clay in Lianyungang district of Jiangsu province is taken as an example. We carry out vibration test of the clay to verify the model, and the test results show that the prediction method in this paper could well reflect the undisturbed soil strength of typical soft clay in Lianyungang.